{
  "id": "math/9802008",
  "version": "v1",
  "published": "1998-02-02T13:46:35.000Z",
  "updated": "1998-02-02T13:46:35.000Z",
  "title": "Phantom Maps and Homology Theories",
  "authors": [
    "J. Daniel Christensen",
    "Neil P. Strickland"
  ],
  "comment": "25 pages, AMSLaTeX, to appear in Topology",
  "categories": [
    "math.AT"
  ],
  "abstract": "We study phantom maps and homology theories in a stable homotopy category S via a certain Abelian category A. We express the group P(X,Y) of phantom maps X -> Y as an Ext group in A, and give conditions on X or Y which guarantee that it vanishes. We also determine P(X,HB). We show that any composite of two phantom maps is zero, and use this to reduce Margolis's axiomatisation conjecture to an extension problem. We show that a certain functor S -> A is the universal example of a homology theory with values in an AB 5 category and compare this with some results of Freyd.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1998-02-02T13:46:35.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "55P42",
      "55N20",
      "55U35",
      "55U99",
      "18E30"
    ],
    "keywords": [
      "homology theory",
      "reduce margoliss axiomatisation conjecture",
      "study phantom maps",
      "stable homotopy category",
      "abelian category"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 25,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "1998math......2008C"
    }
  }
}